<!-- ~/app/spa-loading-template.html -->
<!DOCTYPE html>
<html>
  <head>
    <title>Loading...</title>
    <style>
      body {
        margin: 0;
        background: #b8a1e5;
        color: white;
        font-family: sans-serif;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
      }
    </style>
  </head>
  <body>
    <div>应用加载中...</div>
  </body>
</html>
